///////////////////////////////////////////////////////////////////////////
//                   __                _      _   ________               //
//                  / /   ____  ____ _(_)____/ | / / ____/               //
//                 / /   / __ \/ __ `/ / ___/  |/ / / __                 //
//                / /___/ /_/ / /_/ / / /__/ /|  / /_/ /                 //
//               /_____/\____/\__, /_/\___/_/ |_/\____/                  //
//                           /____/                                      //
//                                                                       //
//               The Next Generation Logic Library                       //
//                                                                       //
///////////////////////////////////////////////////////////////////////////
//                                                                       //
//  Copyright 2015-20xx Christoph Zengler                                //
//                                                                       //
//  Licensed under the Apache License, Version 2.0 (the "License");      //
//  you may not use this file except in compliance with the License.     //
//  You may obtain a copy of the License at                              //
//                                                                       //
//  http://www.apache.org/licenses/LICENSE-2.0                           //
//                                                                       //
//  Unless required by applicable law or agreed to in writing, software  //
//  distributed under the License is distributed on an "AS IS" BASIS,    //
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or      //
//  implied.  See the License for the specific language governing        //
//  permissions and limitations under the License.                       //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

package org.logicng.explanations.unsatcores;

import org.logicng.configurations.Configuration;
import org.logicng.configurations.ConfigurationType;

/**
 * The configuration object for the MUS generation.
 * @version 1.2
 * @since 1.1
 */
public final class MUSConfig extends Configuration {

  /**
   * The algorithm for the MUS generation.
   */
  public enum Algorithm {
    DELETION, PLAIN_INSERTION
  }

  final Algorithm algorithm;

  /**
   * Constructs a new configuration with a given type.
   * @param builder the builder
   */
  public MUSConfig(final Builder builder) {
    super(ConfigurationType.MUS);
    this.algorithm = builder.algorithm;
  }

  @Override
  public String toString() {
    final StringBuilder sb = new StringBuilder("MUSConfig{").append(System.lineSeparator());
    sb.append("algorithm=").append(this.algorithm).append(System.lineSeparator());
    sb.append("}").append(System.lineSeparator());
    return sb.toString();
  }

  /**
   * The builder for a MUS configuration.
   */
  public static class Builder {

    private Algorithm algorithm = Algorithm.DELETION;

    /**
     * Sets the algorithm for the MUS generation. The default value is {@code DELETION}.
     * @param algorithm the algorithm for the MUS generation
     * @return the builder
     */
    public Builder algorithm(final Algorithm algorithm) {
      this.algorithm = algorithm;
      return this;
    }

    /**
     * Builds the configuration.
     * @return the configuration.
     */
    public MUSConfig build() {
      return new MUSConfig(this);
    }
  }
}
